Hi ThoMue and salopette,
We recommend the version 7.9 nightly as pointed out in the information on the Squeezebox Server-Plugin menu. The installation of the server itself, however, should not pose a problem with any version. What happens in your installations when you click on the blue button to open the web interface? Also, how big are your microSD cards and how much space did you have left after installation? You can see the memory and how ich still available in the Settings/Reboot menu in the bottom window called debug info.